package org.stu.tp.util;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.*;
import org.hibernate.cfg.*;

public class HibernateUtil {
    private static Log log = LogFactory.getLog(HibernateUtil.class);
    private static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory
            sessionFactory = new Configuration().configure()
                                                .buildSessionFactory();
        } catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            log.error("Initial SessionFactory creation failed.", ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static final ThreadLocal<Session> session = new ThreadLocal<Session>();

    public static Session currentSession() {
        Session s = (Session) session.get();

        // Open a new Session, if this Thread has none yet
        if (s == null) {
            s = sessionFactory.openSession();
            session.set(s);
        }

        return s;
    }

    public static void closeSession() {
        Session s = (Session) session.get();

        if (s != null) {
            s.close();
        }

        session.set(null);
    }
}
